[Bug 199115] New: [gma500] BUG: unable to handle kernel NULL pointer dereference at 0000000000000081

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=199115

            Bug ID: 199115
           Summary: [gma500] BUG: unable to handle kernel NULL pointer
                    dereference at 0000000000000081
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.15.7-300.fc27.x86_64
          Hardware: x86-64
                OS: Linux
              Tree: Fedora
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: dominik@greysector.net
        Regression: No

Created attachment 274725
  --> https://bugzilla.kernel.org/attachment.cgi?id=274725&action=edit
journalctl -k  --no-hostname --no-pager output

I'm consistently getting this kernel NULL pointer dereference on a Thecus N5550
NAS box (Intel Atom D2550 CPU) on every boot if gma500_gfx module is not
blacklisted:

Mar 14 13:44:02 kernel: BUG: unable to handle kernel NULL pointer dereference
at 0000000000000081
Mar 14 13:44:02 kernel: IP: drm_fb_helper_is_bound.isra.16+0x5/0xa0
[drm_kms_helper]
Mar 14 13:44:03 kernel: PGD 0 P4D 0 
Mar 14 13:44:03 kernel: Oops: 0000 [#1] SMP NOPTI
Mar 14 13:44:03 kernel: Modules linked in: it87 hwmon_vid vfat fat
snd_hda_codec_realtek snd_hda_codec_generic gma500_gfx snd_hda_codec_hdmi
iTCO_wdt iTCO_vendor_support snd
Mar 14 13:44:03 kernel: CPU: 0 PID: 277 Comm: kworker/0:2 Not tainted
4.15.7-300.fc27.x86_64 #1
Mar 14 13:44:03 kernel: Hardware name: Intel Corporation Milstead
Platform/Granite Well, BIOS CDV_T30 X64 09/17/2012
Mar 14 13:44:03 kernel: Workqueue: events output_poll_execute [drm_kms_helper]
Mar 14 13:44:03 kernel: RIP: 0010:drm_fb_helper_is_bound.isra.16+0x5/0xa0
[drm_kms_helper]
Mar 14 13:44:03 kernel: RSP: 0018:ffffb118005ebe28 EFLAGS: 00010286
Mar 14 13:44:03 kernel: RAX: 0000000000000000 RBX: ffff9da9b656c800 RCX:
000000000000e800
Mar 14 13:44:03 kernel: RDX: ffff9da9b632da00 RSI: 0000000000000031 RDI:
ffff9da9b656c800
Mar 14 13:44:03 kernel: RBP: ffff9da9b656c8d0 R08: 00000000000251a0 R09:
0000000000000000
Mar 14 13:44:03 kernel: R10: fffff2ca40f61c00 R11: 0000000000000000 R12:
0000000000000001
Mar 14 13:44:03 kernel: R13: ffff9da9b71e7800 R14: ffff9da9b71e79f8 R15:
0000000000000000
Mar 14 13:44:03 kernel: FS:  0000000000000000(0000) GS:ffff9da9bb400000(0000)
knlGS:0000000000000000
Mar 14 13:44:03 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Mar 14 13:44:03 kernel: CR2: 0000000000000081 CR3: 000000007b2a0000 CR4:
00000000000006f0
Mar 14 13:44:03 kernel: Call Trace:
Mar 14 13:44:03 kernel:  drm_fb_helper_hotplug_event.part.29+0x34/0xb0
[drm_kms_helper]
Mar 14 13:44:03 kernel:  output_poll_execute+0x185/0x1b0 [drm_kms_helper]
Mar 14 13:44:03 kernel:  process_one_work+0x175/0x390
Mar 14 13:44:03 kernel:  worker_thread+0x2e/0x380
Mar 14 13:44:03 kernel:  ? process_one_work+0x390/0x390
Mar 14 13:44:03 kernel:  kthread+0x113/0x130
Mar 14 13:44:03 kernel:  ? kthread_create_worker_on_cpu+0x70/0x70
Mar 14 13:44:03 kernel:  ret_from_fork+0x1f/0x40
Mar 14 13:44:03 kernel: Code: 4c d0 f8 8b 45 20 39 c3 7c e6 83 e8 01 4c 89 ef
31 db 89 45 20 e8 6c b0 ea c4 eb 9f 83 c3 02 eb bf 0f 1f 44 00 00 0f 1f 44 00
00 <48> 8b 56 50 
Mar 14 13:44:03 kernel: RIP: drm_fb_helper_is_bound.isra.16+0x5/0xa0
[drm_kms_helper] RSP: ffffb118005ebe28
Mar 14 13:44:03 kernel: CR2: 0000000000000081
Mar 14 13:44:03 kernel: ---[ end trace 0bc03676f9e43f5d ]---

Full dmesg attached.

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